Vented Type Extruder (For Degassing). With many years of design, manufacturing experience and adopting international advanced technology, our company has developed different series of vented type extruder on base of accepting the user's suggestion. The special efficiency venting screws of different structures (such as separate type, mixing head, barrier type, distribution type, and other combination) are selected for this series of machine, which has excellent venting performance, good plasticize. It is suitable for PP, PE, HIPS, PS, ABS, PMMA, PA, and other engineering plastic. It is especially suitable for processing the claimed material so as to reduce the cost of product greatly.